<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./js/vue.js"></script>
</head>
<body>
    <div id="app">
        <p>FirstName: <input type="text" v-model="firstName"></p>
        <p>LastName: <input type="text" v-model="lastName"></p>
        <p>fullName: {{fullName}}</p>
        <button @click="change">改变</button>
    </div>
</body>
<script>
    const vm=new Vue({
        el:'#app',
        data:{
            firstName:'',
            lastName:'',
        },
        methods: {
            change(){
                this.fullName='Herry Porter'
            }
        },
        computed: {
            fullName:{
                get:function(){
                    return this.firstName+this.lastName
                },
                set:function(val){
                    var arr=val.split(' ');
                    this.firstName=arr[0];
                    this.lastName=arr[1];
                }
            }
        }
    })
</script>
</html>